<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
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    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      Array.prototype.mySome = function (callback) {
        for (let i = 0; i < this.length; i++) {
          if (callback(this[i], i, this)) {
            return true
          }
        }
        return false
      }
      let arr = [1,2,3,4]
      console.log(arr.mySome(item => item >3));
    </script>
  </body>
</html>
